What impact can be expected from this command?Can this be done online?Does this impact the servers performance?This is for a 2005 system, databasesize is 40 Gb.

On a 2008 system a comparable database of 10 Gb was done in 10 secs.On a 2008 R2 system (small) a 200 Gb database was done in just under 6 minutes.Test for a 2005 system on the backup of the database is in preparation.